package org.example.springblogg.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;
import org.example.springblogg.constant.Constants;

import java.security.Key;
import java.util.Date;
import java.util.Map;

@Slf4j
public class JwtUtils {


    //1小时(毫秒表示的)：
    private static final long JWT_EXPIRATION = 60 * 60 * 1000;

    final static String secretStr  = "Lx27wNOx5FuoPymZ+7yhqsAZRCaafBLC65jXOsuKvQA=";
    //生成key：
    final static Key key = Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretStr));

    //生成token：
    public static String genJwtToken(Map<String, Object> claim){
        String token = Jwts.builder().setClaims(claim)
                .setExpiration(new Date(System.currentTimeMillis()+ JWT_EXPIRATION))
                .signWith(key)
                .compact();
        System.out.println(token);
        return token;
    }



    //校验token：true: 校验成功，  false表示校验失败；
    public static Claims parseToken(String token){
        JwtParser build = Jwts.parserBuilder().setSigningKey(key).build();
        Claims claims = null;
        try {
            claims = build.parseClaimsJws(token).getBody();
        }catch (Exception e){
            log.info("解析token失败: token:"+token);
            return null;
        }
        return claims;
    }


    public static  Integer getIdByToken(String token){
        Claims claims = parseToken(token);
        if(claims != null){
            Integer userId = (Integer) claims.get(Constants.TOKEN_ID);
            if(userId > 0){
                return userId;
            }
        }
        return null;
    }
}
